Abstract: A control device for a motor vehicle. In the event of an interruption of an external voltage supply, limited functionality can continue to be maintained. For this purpose, it is provided to deactivate some functional modules of the control device in the event of an interruption of the external supply voltage and to use electrical energy stored in the deactivated functional modules for the voltage supply of further functional modules.

Abstract: Described is a circuit arrangement of a control device for monitoring a voltage with regard to voltage deviations above a specific voltage value, and for outputting a reset signal for interlocking of output elements that are controlled by the control device if a voltage deviation above the voltage value arises. The arrangement includes an arrangement for generating a reference voltage, a first comparator for comparing the reference voltage with a first comparison voltage value, which is derived from the voltage to be monitored multiplied by a first proportionality factor, and for outputting the reset signal, and a second comparator.